consumption by pregnant women leads to a decreased risk of their children developing symptoms of attention deficit hyperactivity disorder by the age of eight. but at the same time mercury in fish leads to a higher incidence of a-d-h-d symptoms. the children in the study were not diagnosed with a-d-h-d.. but only exhibited some of the symptoms. the researchers say pregnant women should eat fish low in mercury. such as salmon. a new study suggests that the herbal remedy echinacea can prevent the common cold. researchers in the u-k found that taking three daily doses echinacea for four months reduced the number of colds.. as well as the duration of the illness. the treatment also cut the number of recurrent colds by 60 percent among those with weak immune systems or a history of recurrent colds. several previous studies have suggested that echinacea could soothe symptoms and cut colds short but there was only limited evidence it could prevent the illness from ever taking hold. lunchbreak is next. a preview of this weekend's oyster fest. the chef from "shaw's crab house" is here with how to properly s